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Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane

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Introduction

Coursework: Introduction: Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. A selectively permeable membrane is one that allows unrestricted passage of water, but not solute molecules or ions. On the side of the membrane with higher free water concentration (i.e. a lower concentration of solute), more water molecules will strike the pores in the membrane in a give interval of time. More strikes equates to more molecules passing through the pores, which in turn results in net diffusion of water from the compartment with high concentration of free water to that with low concentration of free water. The key to remember about osmosis is that water flows from the solution with the lower solute concentration into the solution with higher solute concentration. ...read more.

Middle

The cell is likely to swell up. 3 If the medium is exactly the same water concentration as the cell there will be no net movement of water across the cell membrane. Water crosses the cell membrane in both directions, but the amount going in is the same as the amount going out, so there is no overall movement of water. The cell will stay the same size. If the medium has a lower concentration of water than the cell (a very concentrated solution) the cell will lose water by osmosis. Again, water crosses the cell membrane in both directions, but this time more water leaves the cell than enters it. Therefore the cell will shrink. Hypothesis: My hypothesis is that the one in water will grow because it has a higher concentration but the one in sugar has a lower concentration so therefor it wont grow. ...read more.

Conclusion

Independent variables:- the variables that we will change is the amount of sugar in the s solution the range will be 0.0m - 1m Number and range:- Solution Size of chip Solution +/- Mm after test Difference +/- Mm 0.0m 30mm 10ml 3.1mm 1mm 0.2m 30mm 10ml 3.2mm 2mm 0.4m 30mm 10ml 3.1mm 1mm 0.6m 30mm 10ml 2.9mm -1mm 0.8m 30mm 10ml 2.9mm -1mm 1.0m 30mm 10ml 2.9mm -1mm Solution Size of chip Solution +/- Mm after test Difference +/- Mm 0.0m 30mm 10ml 3.2mm 2mm 0.2m 30mm 10ml 3.2mm 1mm 0.4m 30mm 10ml 3.5mm 5mm 0.6m 30mm 10ml 3.3mm 3mm 0.8m 30mm 10ml 3mm 0mm 1.0m 30mm 10ml 3mm 0mm Solution Size of chip Solution +/- Mm after test Difference +/- Mm 0.0m 30mm 10ml 2.3mm -7mm 0.2m 30mm 10ml 3.4mm 4mm 0.4m 30mm 10ml 3.2mm 2mm 0.6m 30mm 10ml 3.5mm 5mm 0.8m 30mm 10ml 3.3mm 3mm 1.0m 30mm 10ml 3.2mm 2mm ...read more.

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